Kang Ho Goo (Choi Woo Shik) has never had a proper girlfriend, with girls constantly taking advantage of his sweet, naive nature by enjoying all the benefits of dating then friend zone-ing him. His relationship-savvy twin sister Kang Ho Kyung (Lee Soo Kyung) mocks him and his best friends Kim Tae Hee (Choi Jae Hwan) and Shin Chung Jae (Lee Shi Un) for being sorely lacking in any dating skills. Do Do Hee (UEE) is an athlete on the Korean national swimming squad, and won the silver medal at the recent Asian Games. Driven and competitive, she's frustrated at never getting first place and is known for cursing a lot. The timid, bullied Ho Goo had a crush on Do Hee in their teens, when her beauty and sports cred made her the most popular girl in high school. She's the only reason he goes to their high school reunion, and when they meet again, he's surprised to learn that she remembers him. Ho Goo grabs the chance to spend time with the girl of his dreams, not knowing that Do Hee has a secret, that she's pregnant possibly by her ex-boyfriend Byun Kang-chul (Im Seul Ong), their class president and now a successful lawyer.

Ooh, I’m so happy I watched this, I was so close to just drop it in the beginning because I heard some negative stuff about it. Nope, not true, it’s a wonderful drama, that make you smile all the time. The comedy, romance, friendship everything about it had a really nice and fresh aura over it. Why it was so good? Mainly because of the originality in the drama, it had many elements we normally don’t see in a kdrama such as decent treatment of some risqué themes. It also frequently surprised me by taking a whole other direction with the plot than I expected, and can I just make a shoutout to the awesome parental characters that behave in such a refreshingly awesome ways. Ho Goo… The writer took a character that could have been just a fool and just a sicky sweet guy and made him so real and warm that it truly is a feat of genius. I think what is most amazing about Ho Goo and the way he is written and acted is that he makes everyone else in the world look like the fool that they think he is. It’s like he has got it right and we are all wrong. Do Hee which is UEE's character was okay, I had her all wrong in the beginning but towards the end I fell in love with her, she is pretty awesome.
The cutest baby award has to go to Geum Dong in this drama!